In a high-tech North Pole command center, Santa Claus oversees a complex operation to deliver presents to children around the world using a massive, state-of-the-art sleigh-ship named the S-1, operated by a well-organized team of elves. Santa’s eldest son, Steve, efficiently manages the entire operation and anticipates becoming the next Santa. However, the heart of the story centers on Santa’s clumsy yet kind-hearted younger son, Arthur, who is relegated to answering letters from children and is considered a misfit in the family’s Christmas machine. Despite his awkwardness, Arthur possesses an unwavering belief in the magic of Christmas and deeply cares about every child's happiness.

When a single gift for a young girl is accidentally overlooked, Arthur embarks on a mission to deliver the present before dawn, determined to ensure no child is left disappointed on Christmas morning. With the aid of his spirited and adventurous Grand-Santa, Arthur sets off in the antique, reindeer-driven sleigh, encountering numerous challenges along the way. As they race against time, Arthur and Grand-Santa must navigate various obstacles, showcasing Arthur's determination and the importance of believing in the magic of the season, ultimately reinforcing the true meaning of Christmas and family. The journey also reveals deeper dynamics within the Claus family, emphasizing themes of unity, tradition, and modernization.